本文選題：協(xié)作頻譜共享 + 分?jǐn)?shù)傅里葉變換��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：無線通信網(wǎng)絡(luò)的高能耗和通信需求的指數(shù)性增長(zhǎng)對(duì)設(shè)計(jì)具備更高能量效率和頻譜效率的綠色通信提出了嚴(yán)峻的挑戰(zhàn),以應(yīng)對(duì)無線資源的稀缺。有效解決辦法認(rèn)知無線電被提出作為提高通信系統(tǒng)頻譜效率的關(guān)鍵手段之一。因此,在確保主用戶正常通信的條件下,開放已授權(quán)頻段使次級(jí)用戶和主用戶一同占用頻譜的頻譜共享技術(shù),成為認(rèn)知無線電系統(tǒng)的研究熱點(diǎn)。本文基于能效和譜效的協(xié)作頻譜共享平臺(tái),從能效和譜效角度出發(fā),研究了協(xié)作頻譜共享系統(tǒng)性能與次級(jí)用戶選擇、協(xié)作模式選擇及次級(jí)用戶功率分配等的關(guān)系,設(shè)計(jì)實(shí)現(xiàn)了綠色高效的頻譜共享策略。首先,本文研究了認(rèn)知無線電的關(guān)鍵技術(shù),歸納總結(jié)了頻譜共享的系統(tǒng)模型和主要技術(shù),并給出了本文的頻譜共享平臺(tái)模型。接著針對(duì)協(xié)作通信技術(shù)中的幾種協(xié)作模式進(jìn)行了概括分析。然后給出了分?jǐn)?shù)域處理的概念,并仿真分析了Chirp信號(hào)的分?jǐn)?shù)域能量聚集特性。最后針對(duì)常見的能效和譜效聯(lián)合優(yōu)化算法進(jìn)行了簡(jiǎn)單的分析介紹。然后,本文設(shè)計(jì)了統(tǒng)計(jì)信道信息已知模型中基于能效和譜效的協(xié)作頻譜共享策略。在此策略中,次級(jí)用戶依據(jù)信道狀態(tài)實(shí)時(shí)選擇協(xié)作模式進(jìn)行協(xié)作。然后在主用戶中斷概率約束條件下,設(shè)計(jì)了最大化次級(jí)用戶系統(tǒng)能效的功率分配算法和最大化系統(tǒng)譜效的多次級(jí)用戶選擇算法,給出了優(yōu)化的協(xié)作頻譜共享策略。仿真結(jié)果表明,所提協(xié)作頻譜共享策略顯著地降低了對(duì)主用戶的干擾,保證了主用戶的通信需求,同時(shí)顯著提高次級(jí)用戶系統(tǒng)能量效率和系統(tǒng)頻譜效率。此外,次級(jí)用戶系統(tǒng)的中斷性能和數(shù)據(jù)傳輸速率隨次級(jí)用戶數(shù)的增多都得到了明顯提升。最后,針對(duì)信道的快速時(shí)變性,本文進(jìn)一步研究了瞬時(shí)信道信息已知模型下基于能效和譜效的協(xié)作頻譜共享策略。此策略中,主用戶和次級(jí)用戶分別采用正弦信號(hào)和Chirp信號(hào),在滿足主用戶速率需求的前提下,以最大化系統(tǒng)頻譜效率為目標(biāo)進(jìn)行次級(jí)用戶選擇,以最大化次級(jí)用戶系統(tǒng)能量效率為目標(biāo)進(jìn)行所選次級(jí)用戶的功率分配,最終通過兩者的聯(lián)合優(yōu)化實(shí)現(xiàn)頻譜共享性能的提升。仿真結(jié)果顯示,所提協(xié)作頻譜共享策略極大地降低了對(duì)主用戶的干擾,主用戶系統(tǒng)和次級(jí)用戶系統(tǒng)的中斷性能明顯提高,次級(jí)用戶系統(tǒng)的能量效率顯著提高,系統(tǒng)的頻譜效率大幅提升。
[Abstract]:The high energy consumption of wireless communication networks and the exponential growth of communication demand pose a severe challenge to the design of green communications with higher energy efficiency and spectral efficiency in order to cope with the scarcity of wireless resources. Cognitive radio, an effective solution, is proposed as one of the key means to improve the spectral efficiency of communication systems. Therefore, under the condition of ensuring the normal communication of the primary users, opening up the spectrum sharing technology in the authorized frequency band, which allows the secondary users and the primary users to share the spectrum together, has become a hot research topic in cognitive radio systems. Based on the cooperative spectrum sharing platform based on energy efficiency and spectral effect, this paper studies the relationship between the performance of cooperative spectrum sharing system and secondary user selection, cooperation mode selection and secondary user power allocation from the perspective of energy efficiency and spectrum effect. A green and efficient spectrum sharing strategy is designed and implemented. Firstly, this paper studies the key technologies of cognitive radio, summarizes the system model and main technologies of spectrum sharing, and gives the spectrum sharing platform model of this paper. Then, several cooperation modes in the cooperative communication technology are summarized and analyzed. Then, the concept of fractional domain processing is presented, and the fractional energy aggregation characteristics of Chirp signal are simulated and analyzed. Finally, the common energy efficiency and spectral optimization algorithms are analyzed and introduced briefly. Then, a cooperative spectrum sharing strategy based on energy efficiency and spectral effect in the known statistical channel information model is designed. In this strategy, the secondary user selects the cooperation mode according to the channel state in real time. Then, under the constraint of the primary user interrupt probability, the power allocation algorithm for maximizing the energy efficiency of the secondary user system and the multi-stage user selection algorithm for maximizing the spectral efficiency of the system are designed, and an optimized cooperative spectrum sharing strategy is proposed. Simulation results show that the proposed cooperative spectrum sharing strategy can significantly reduce the interference to the primary user, ensure the communication requirements of the primary user, and significantly improve the energy efficiency and spectrum efficiency of the secondary user system. In addition, the interrupt performance and the data transmission rate of the secondary user system are obviously improved with the increase of the number of secondary users. Finally, in view of the fast time-varying of the channel, this paper further studies the cooperative spectrum sharing strategy based on energy efficiency and spectral effect under the known model of instantaneous channel information. In this strategy, the primary user and the secondary user adopt the sinusoidal signal and the Chirp signal respectively. Under the premise of satisfying the demand of the primary user rate, the secondary user is selected in order to maximize the system spectrum efficiency. In order to maximize the energy efficiency of the secondary user system, the power allocation of the selected secondary user is carried out, and the spectrum sharing performance is improved through the joint optimization of the two. The simulation results show that the proposed cooperative spectrum sharing strategy greatly reduces the interference to the primary user, improves the interrupt performance of the primary user system and the secondary user system, and improves the energy efficiency of the secondary user system. The spectral efficiency of the system is greatly improved.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN925

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